ebiten/internal/ui/ui_windows.go

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// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !js
package ui
import (
"fmt"
"syscall"
"unsafe"
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"github.com/hajimehoshi/ebiten/internal/devicescale"
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"github.com/hajimehoshi/ebiten/internal/glfw"
)
const (
smCyCaption = 4
monitorDefaultToNearest = 2
)
type rect struct {
left int32
top int32
right int32
bottom int32
}
type monitorInfo struct {
cbSize uint32
rcMonitor rect
rcWork rect
dwFlags uint32
}
var (
// user32 is defined at hideconsole_windows.go
procGetSystemMetrics = user32.NewProc("GetSystemMetrics")
procGetActiveWindow = user32.NewProc("GetActiveWindow")
procGetForegroundWindow = user32.NewProc("GetForegroundWindow")
procMonitorFromWindow = user32.NewProc("MonitorFromWindow")
procGetMonitorInfoW = user32.NewProc("GetMonitorInfoW")
)
func getSystemMetrics(nIndex int) (int, error) {
r, _, e := syscall.Syscall(procGetSystemMetrics.Addr(), 1, uintptr(nIndex), 0, 0)
if e != 0 {
return 0, fmt.Errorf("ui: GetSystemMetrics failed: error code: %d", e)
}
return int(r), nil
}
func getActiveWindow() (uintptr, error) {
r, _, e := syscall.Syscall(procGetActiveWindow.Addr(), 0, 0, 0, 0)
if e != 0 {
return 0, fmt.Errorf("ui: GetActiveWindow failed: error code: %d", e)
}
return r, nil
}
func getForegroundWindow() (uintptr, error) {
r, _, e := syscall.Syscall(procGetForegroundWindow.Addr(), 0, 0, 0, 0)
if e != 0 {
return 0, fmt.Errorf("ui: GetForegroundWindow failed: error code: %d", e)
}
return r, nil
}
func monitorFromWindow(hwnd uintptr, dwFlags uint32) (uintptr, error) {
r, _, e := syscall.Syscall(procMonitorFromWindow.Addr(), 2, hwnd, uintptr(dwFlags), 0)
if e != 0 {
return 0, fmt.Errorf("ui: MonitorFromWindow failed: error code: %d", e)
}
if r == 0 {
return 0, fmt.Errorf("ui: MonitorFromWindow failed: returned value: %d", r)
}
return r, nil
}
func getMonitorInfoW(hMonitor uintptr, lpmi *monitorInfo) error {
r, _, e := syscall.Syscall(procGetMonitorInfoW.Addr(), 2, hMonitor, uintptr(unsafe.Pointer(lpmi)), 0)
if e != 0 {
return fmt.Errorf("ui: GetMonitorInfoW failed: error code: %d", e)
}
if r == 0 {
return fmt.Errorf("ui: GetMonitorInfoW failed: returned value: %d", r)
}
return nil
}
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func glfwScale() float64 {
// This function must be called on the main thread.
return devicescale.GetAt(currentUI.currentMonitor().GetPos())
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}
func adjustWindowPosition(x, y int) (int, int) {
// As the video width/height might be wrong,
// adjust x/y at least to enable to handle the window (#328)
if x < 0 {
x = 0
}
t, err := getSystemMetrics(smCyCaption)
if err != nil {
panic(err)
}
if y < t {
y = t
}
return x, y
}
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func (u *userInterface) currentMonitorFromPosition() *glfw.Monitor {
// TODO: Should we use u.window.GetWin32Window() here?
w, err := getActiveWindow()
if err != nil {
panic(err)
}
if w == 0 {
// There is no window at launching, but there is a hidden initialized window.
// Get the foreground window, that is common among multiple processes.
w, err = getForegroundWindow()
if err != nil {
panic(err)
}
if w == 0 {
// GetForegroundWindow can return null according to the document. Use
// the primary monitor instead.
return glfw.GetPrimaryMonitor()
}
}
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// Get the current monitor by the window handle instead of the window position. It is because the window
// position is not relaiable in some cases e.g. when the window is put across multiple monitors.
m, err := monitorFromWindow(w, monitorDefaultToNearest)
if err != nil {
panic(err)
}
mi := monitorInfo{}
mi.cbSize = uint32(unsafe.Sizeof(mi))
if err := getMonitorInfoW(m, &mi); err != nil {
panic(err)
}
x, y := int(mi.rcMonitor.left), int(mi.rcMonitor.top)
for _, m := range glfw.GetMonitors() {
mx, my := m.GetPos()
if mx == x && my == y {
return m
}
}
return glfw.GetPrimaryMonitor()
}
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func (u *userInterface) nativeWindow() uintptr {
return u.window.GetWin32Window()
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}